1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
2 * Copyright (C) 2011 yongzh (freeman.yong@gmail.com) *
4 * This program is free software; you can redistribute it and/or modify *
5 * it under the terms of the GNU General Public License as published by *
6 * the Free Software Foundation; either version 2 of the License, or *
7 * (at your option) any later version. *
9 * This program is distributed in the hope that it will be useful, *
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
12 * GNU General Public License for more details. *
14 * You should have received a copy of the GNU General Public License *
15 * along with this program; if not, write to the *
16 * Free Software Foundation, Inc., *
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
18 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
20 #include "FrameSkipper.h"
23 FrameSkipper::FrameSkipper()
24 : skipType(AUTO), maxSkips(2), targetFPS(60)
28 void FrameSkipper::start()
35 void FrameSkipper::update()
37 // for the first frame
38 if (initialTicks == 0) {
39 initialTicks = ticksGetTicks();
43 unsigned int elapsed = ticksGetTicks() - initialTicks;
44 unsigned int realCount = elapsed * targetFPS / 1000;
47 if (realCount >= virtualCount) {
48 if (realCount > virtualCount &&
49 skipType == AUTO && skipCounter < maxSkips) {
52 virtualCount = realCount;
57 if (skipType == MANUAL) {
58 if (++skipCounter > maxSkips)